In a piezoelectric transformer comprising a ceramic body in the form of an elongate plate of piezoelectric material with one half polarized in the direction of thickness and the remaining half in the longitudinal direction, a pair of input electrodes secured to the opposite sides of said one half and an output electrode secured to the end surface of the remaining half, there is provided supporting means including means for mechanically clamping and supporting the piezoelectric transformer at at least one of the transverse line nodes of the longitudinal mechanical vibrational movement thereof which support permits free longitudinal vibrations while suppressing undesirable vibrating modes.
A piezoelectric element is polarized by applying electroconductive rubber pads on the opposite surfaces of the low voltage driving portion and on the end surface of the high voltage output portion and by applying DC polarization voltages across these pads while the element is being maintained in insulating oil.
A piezoelectric transformer includes a piezoelectric plate in which a pair of cuts are formed in the piezoelectric plate at a position corresponding to a nodal point of the piezoelectric plate. The pair of cuts form a cut-out projection. Connection electrodes electrically connected to input electrodes are respectively formed on input-side cut-out projections. In this piezoelectric transformer, the desired support and electrical connection are made through the cut-out projections.
A piezoelectric-transformer and carrier arrangement in which the carrier is press-molded from elastic material, for example, silicon rubber and has integrated binding belt and retainers for securing the piezoelectric-transformer to the carrier body, for enabling the input and output terminal lead wires of the piezoelectric-transformer to be directly connected to an external device, for example, a circuit board.
A piezoelectric transformer (101) comprises a layered structure (15) formed by alternately stacking a plurality of internal electrodes (13) and a plurality of piezo-electric ceramics layers (103) in thickness direction, first electrodes (21, 23) formed on side surfaces of said layered structure (15) and connected to said internal electrodes (13), at least one pair of second electrodes (27, 29, 31, 33, 35, 37) formed on the side surfaces in areas different from those of the first electrodes (21, 23) and having a same potential, and a circuit board for driving the piezoelectric transformer. The piezoelectric transformer (101) is mounted on the circuit board. Each of the at least one pair of the second electrodes (27, 29, 31, 33, 35, 37) opposite to each other is electrically connected to the circuit board.
A laminated piezoelectric transformer has one through-hole formed in the laminated piezoelectric transformer at a center position which becomes a node of vibration of the laminated piezoelectric transformer, and a support rod member is inserted in the through-hole and bonded to the through-hole by a bonding agent, for supporting the laminated piezoelectric transformer.
